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(No Model.) 2 Sheets-sheet 1.

, J. C. GITHENS; Device for-the Support of Steam Rock Drill.

No. 235,079. Patented Dec. 7,1880.

v L I W I 1 I /fame N4 PETERS, PHOTO-LITHOGRAPHER. WASHINGTON. D c.

(No Model.) 'ZShets-Sheet 2.

- J. O. GIITHENS. v Device for the Support of Steam Rook Drill.

N0. 235,079. Patented Dec. 7,1880.

u PETERS. FHOTO LITHOGRAFREE WASHINGTON. D c.

Nrren STATES ATENT FICE.

JOSEPH O. GITHENS, OF NEW YORK, N. Y., ASSIGNOR T0 RAND DRILL COMPANY, OF SAME PLACE.

DEVICE FOR THE SUPPORT OF STEAM ROCK-DRILLS.

SPECIFICATION forming part of Letters Patent No. 235,079, dated December 7, 1880.

Application filed October 15, 1880.

To all whom it may concern:

Be it known that I, J OSEPH O. GITHENS, of the city and State of New York, have invented certain Improvements in Devices for the Support of Steam Rock-Drills, of which the following is a specification.

My improvements relate to the class of devices for supporting rock-drills employed in sinking vertical shafts.

Heretofore rook drills so employed have been mounted upon the free ends of arms adapted to oscillate in a vertical plane by being hung upon an extensible beam arranged transversely across the shaft and deriving its support by the thrust of its ends against the opposite walls of the shaft.

My invention consists in devices giving the arms upon which the rock-drills are mounted the added capacity of oscillation in a plane parallel with the axis of the beam, and in devices for locking thelongitudinal screw which gives the beam its extensible character, and in the provision of extensible weighted legs, which are affixed to a ring which is movable upon the beam. The objects of the weighted legs are to steady the beam and to add to its inertia, in order to better enable it to resist the shocks resulting from the use of the rockdrills which are supported by it.

The accompanying drawings, representing rook-drill-supporting devices containing my improvements, are as follows:

Figure 1 is a side elevation representing the beam and the arms which support the rock-drill as they appear when occupying, respectively, parallel horizontal planes. Fig. 2 is a top view of the same. Fig. 3 is an end elevation. Fig. 4 is a transverse vertical section through the line 00 w on Fig. 2. Fig. 5 is a central longitudinal section of the end portion of the beam, showing the screw-bolt and the short tube or clamping-band in which the stem of the screw-bolt is journaled. Fig. 6 is a transverse section through the line 3/ y on Fig. 5.

The structure represented in the drawings consists of a metallic tubular beam, A, made extensible by the insertion into one of its ends of the longitudinal screw-bolt a, the head of which is provided with the transverse holes a, for the insertion of the bars used to turn (No model.)

the screw-bolt. Upon its outer end the head of the screw-bolt is provided with the cylindrical stem a which is journaled in one end of the slotted tube B, the opposite end of which abuts against the side of the shaft, or, preferably, against a block of wood, 13, interposed between it and the side of the shaft.

The stem a is provided with a circumferential groove, a to admit the transverse screwbolt 1), which serves both as akey to retain the stem in the slotted tube B and also as a means of clamping the tube tightly upon the stem when the screw-bolt has been adjusted in the proper position to make the end thrust of the beam exert suitable friction upon the sides of the shaft or upon the wooden blocks B B interposed, respectively, between the opposite sides of the shaft and the ends of the beam.

Each of the arms 0, upon one end, 0, of which a rock-drill is mounted, has cast upon its side, at the opposite end, the disk 0, the face of which is parallel to the arm and bears upon a corresponding disk, d, cast upon the side of the circular clamp D, which embraces the beam, and is held in any desired position by means of the clampingbolt D, inserted transversely through the lugs d and 6?, cast, respectively, upon the ends of the clampingband.

The disks 0 and d are centrally perforated to admit the bolt 0', which extends through a transverse perforation near the end of the arm 0," and is provided exteriorly with a nut by which it maybe tightened to make the connection of the arm with the clamp rigid, or loosened to allow the arm to be swung in a plane parallel with the longitudinal axis of the beam.

The drawings represent the beam as provided with two arms, one at either end. It

provided With the set-screws f, for securing the hollow leg upon the stem in any desired position.

I claim as my invention- 1. A beam for the support of rock-drills employed in drilling vertical shafts, made extensible by means of the usual longitudinal screw-bolt a, in combination with the slotted clamping band or tube B, provided with the clamping-bolt b, in which tube theoireumferentially-grooved stem (0 of the screw-bolt a is journaled, substantially as and for the purpose set forth. 7

2. A beam for the support of rock drills employed in drilling vertical shafts, provided With one or more arms, upon the free ends of which, respectively, the drill cylinders are mounted, each arm being affixed to an adiustable clamping-band surrounding the beam by means of the clamping bolt or pivot D, extending transversely through the arm and through the disks 0 and d, for the purpose of imparting to the arm the capacity of oscillatory adjustment in a plane parallel with the longitudinal axis of the beam, substantially as described.

3. A beam for the support of rock-drills employed in drilling vertical shafts, provided with the weighted legs F, affixed to the mov able ring E, surrounding the beam, substantially as and for the purpose set forth.

JOSEPH O. GITHENS.

Witnesses EDWD. PAYSON, M. L. ADAMS. 

